Knuckle appears in the series and is usually equipped by a martial artist. In the main series knuckles are automatically equipped to characters, while in Suikoden Tierkreis it can be found in a treasure chest, weapon shop or given by another character.
Knuckles always come together as a pair. It has good attack power, they can enhance the playable characters skill sets and may even allow for multiple attacks per turn. Knuckle weapons come in all different shapes, sizes and forms.